Rewrite github actions (from original build workflow)

.github/workflows/docker-io.yaml

@@ -0,0 +1,53 @@
+name: Publish Docker image (io)
+
+on:
+  push:
+    tags:
+
+    # TODO: 後で消す
+    branches:
+      - migrate/github-actions
+
+  workflow_dispatch:
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to GitHub Container Registry
+    runs-on: ubuntu-22.04
+    if: github.repository == 'MisskeyIO/misskey'
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v3
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2.5.0
+        with:
+          platforms: linux/amd64,linux/arm64
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/misskeyio/misskey
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Prepare image tags
+        run: |
+          echo "FORMATTED_BRANCH_NAME=$(echo ${{ github.ref_name }} | sed -e 's/\//-/g' )" >> $GITHUB_ENV
+      - name: Build and Push to Docker Hub
+        uses: docker/build-push-action@v4
+        with:
+          builder: ${{ steps.buildx.outputs.name }}
+          context: .
+          push: true
+          platforms: ${{ steps.buildx.outputs.platforms }}
+          provenance: false
+          labels: ${{ env.FORMATTED_BRANCH_NAME }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          tags: |
+            ghcr.io/misskeyio/misskey:latest
+            ghcr.io/misskeyio/misskey:${{ env.FORMATTED_BRANCH_NAME }}